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You can change the map projection method between Mercator, and some others. Be aware that projections maybe only valid for a certain area of the world.[[BR]]

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The default projection for JOSM is Mercator. This projection has certain advantages, one of them is that geometric figures (e.g. circles and rectangles) aren't deformed when displayed.

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The default projection for JOSM is Mercator. This projection has certain advantages, one of them is that geometric figures (e.g. circles and rectangles) aren't deformed when displayed. This is useful for mapping.

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When you use rasterized background imagery then you need to set a projection supported by the service providing this imagery. JOSM is not able to change raster images. When image projection and current settings do not match, you get warned.

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JOSM is able to automatically reproject raster images from the projection of the source to the projection that is set in JOSM. To avoid having set an unsuitable projection for a long time JOSM resets the projection setting to Mercator at every restart. In [ExpertMode Expert mode] you can set another projection as default with the "Set as default" button.

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You can also change the system of measurement here (Metric, Chinese, Imperial, Nautical Mile). You can also change ''system of measuremen'' from the [wiki:Help/StatusBar status bar].

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You can also change the system of measurement here (Metric, Chinese, Imperial, Nautical Mile). (You can also change it in the [wiki:Help/StatusBar status bar].)